Bi-Weekly Mortgage Calculator
See how much faster you pay off your mortgage with biweekly payments
Last updated: November 2025
Loan Details
Auto-computed from loan, rate, and term
Biweekly Payment
$948.10
every 2 weeks (26 payments per year)
Monthly vs Biweekly Comparison
| Metric | Monthly | Biweekly | Savings |
|---|---|---|---|
| Payment Amount | $1,896.20/mo | $948.10/2wk | Same monthly equivalent |
| Payments Per Year | 12 | 26 (= 13 monthly) | +1 payment/yr |
| Time to Payoff | 30.0 yrs | 24.2 yrs | 5.8 yrs faster |
| Total Interest | $382,633 | $295,377 | $87,256 |
Loan Balance Over Time
Understanding Biweekly Mortgages
The Math Behind 26 Half-Payments
A standard 30-year mortgage on a $300,000 loan at 6.5 percent has a monthly principal-and-interest payment of about $1,896. On a monthly schedule you pay $22,752 per year (12 payments). On a biweekly schedule you pay $948 every 14 days, and because there are 26 biweekly periods in a year, you end up paying $24,648 per year, the equivalent of 13 monthly payments. That extra $1,896 goes entirely to principal each year, which shortens the loan by roughly 5 years and saves about $66,000 in interest over the life of the loan.
The DIY Alternative
You do not need to enroll in a formal biweekly program to capture these savings. The simplest method is to take your monthly payment, divide by 12, and add that amount as extra principal to each monthly payment. For the $1,896 example, you would add $158 of extra principal each month. This achieves the identical 13-payments-per-year effect with no enrollment fee, no transaction cost, and no risk of payments being held in suspense.
Watch Out For Servicer Practices
Not all servicers apply biweekly payments immediately to principal. Some hold each half-payment in a non-interest-bearing suspense account and only release the funds to principal once the full monthly amount accumulates. When that happens, your interest savings are negligible, you simply pre-pay by two weeks instead of accelerating principal reduction. Always confirm in writing how your servicer handles biweekly payments before signing up for a program.
Biweekly Plus Refinance
Biweekly and refinancing are complementary strategies, not substitutes. If current rates are well below your existing rate, refinancing locks in lower interest on every dollar you owe. Once refinanced, you can then add biweekly or extra-principal payments on the new lower-rate loan and accelerate payoff even more aggressively. A homeowner who refinances from 7 percent to 5.5 percent and adds DIY biweekly payments can save six figures in total interest on a typical 30-year mortgage.
Frequently Asked Questions
How does a biweekly mortgage payment accelerate payoff?
A biweekly schedule pays half your monthly payment every two weeks. Because there are 52 weeks (26 biweekly periods) in a year, you make 26 half-payments, which equals 13 full monthly payments per year instead of 12. That extra payment goes entirely to principal and typically shortens a 30-year mortgage by 4 to 6 years and saves tens of thousands in interest.
Should I enroll in a lender biweekly program or DIY?
You can replicate the exact same payoff acceleration on your own by simply adding 1/12 of your monthly payment as extra principal each month. Lender biweekly programs sometimes charge enrollment fees ($200-$400) and recurring transaction fees. The DIY approach is free, gives you the same result, and lets you stop at any time without lender involvement. Just label the extra amount as "additional principal" on each payment.
What enrollment fees should I watch for with biweekly mortgage programs?
Some third-party services and even some lender-administered biweekly programs charge an upfront enrollment fee of $200 to $400, plus per-payment transaction fees of $2 to $5. Over 30 years these fees can total $1,500 to $2,500. There is no need to pay any fee, the DIY method (sending 1/12 extra principal monthly) achieves identical results for free.
Does biweekly always work if my lender accepts the extra payments?
No. Some lenders hold biweekly half-payments in a suspense account and only apply them once the full monthly amount accumulates, which means the principal reduction happens 2 weeks later instead of 2 weeks earlier. The interest savings are then almost zero. Confirm with your servicer that biweekly payments are applied to principal as received, or use the DIY monthly approach to guarantee the extra payment posts immediately.
When is refinancing a better choice than going biweekly?
Refinancing makes more sense than biweekly when current market rates are 0.75 percentage points or more below your existing rate. A rate drop saves money on every payment for the remaining life of the loan, while biweekly only accelerates payoff at your existing rate. The two strategies are not mutually exclusive, refinance first to lock in a lower rate, then add biweekly or extra-principal payments to retire the loan even faster.